ASM Grid disks dropped randomly or missing after reboot
Last updated on MARCH 17, 2016
Applies to:Oracle Database Appliance X5-2 - Version All Versions and later
Information in this document applies to any platform.
Oracle cluster services going down randomly and some ASM grid disks are missing and dropped, or some ASM disks missing after a reboot.
This query in ASM shows missing disks.
select group_number, disk_number, name, label, path, redundancy, mount_status, header_status from v$asm_disk where mount_status='MISSING'
You can add the disks back, but then these or other disks will eventually be dropped for no apparent reason and may show missing after a reboot.
The ASM alert log shows messages such a following related to dropped disks:
WARNING: Started Drop Disk Timeout for Disk 2 (SSD_E0_S23_1310812220P1) in group 4 with a value 12960
WARNING: Started Drop Disk Timeout for Disk 3 (SSD_E0_S22_1310812236P1) in group 4 with a value 12960
WARNING: Disk 2 (SSD_E0_S23_1310812220P1) in group 4 will be dropped in: (12042) secs on ASM inst 2
WARNING: Disk 3 (SSD_E0_S22_1310812236P1) in group 4 will be dropped in: (12042) secs on ASM inst 2
A review of the disks and hardware does not indicate any disk issues.
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